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/*
* Example fingerprint verification program, which verifies the right index
* finger which has been previously enrolled to disk.
* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libfprint/fprint.h>
struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
{
struct fp_dscv_dev *ddev = discovered_devs[0];
struct fp_driver *drv;
if (!ddev)
return NULL;
drv = fp_dscv_dev_get_driver(ddev);
printf("Found device claimed by %s driver\n", fp_driver_get_full_name(drv));
return ddev;
}
int verify(struct fp_dev *dev, struct fp_print_data *data)
{
int r;
do {
struct fp_img *img = NULL;
sleep(1);
printf("\nScan your finger now.\n");
r = fp_verify_finger_img(dev, data, &img);
if (img) {
fp_img_save_to_file(img, "verify.pgm");
printf("Wrote scanned image to verify.pgm\n");
fp_img_free(img);
}
if (r < 0) {
printf("verification failed with error %d :(\n", r);
return r;
}
switch (r) {
case FP_VERIFY_NO_MATCH:
printf("NO MATCH!\n");
return 0;
case FP_VERIFY_MATCH:
printf("MATCH!\n");
return 0;
case FP_VERIFY_RETRY:
printf("Scan didn't quite work. Please try again.\n");
break;
case FP_VERIFY_RETRY_TOO_SHORT:
printf("Swipe was too short, please try again.\n");
break;
case FP_VERIFY_RETRY_CENTER_FINGER:
printf("Please center your finger on the sensor and try again.\n");
break;
case FP_VERIFY_RETRY_REMOVE_FINGER:
printf("Please remove finger from the sensor and try again.\n");
break;
}
} while (1);
}
int main(void)
{
int r = 1;
struct fp_dscv_dev *ddev;
struct fp_dscv_dev **discovered_devs;
struct fp_dev *dev;
struct fp_print_data *data;
r = fp_init();
if (r < 0) {
fprintf(stderr, "Failed to initialize libfprint\n");
exit(1);
}
fp_set_debug(3);
discovered_devs = fp_discover_devs();
if (!discovered_devs) {
fprintf(stderr, "Could not discover devices\n");
goto out;
}
ddev = discover_device(discovered_devs);
if (!ddev) {
fprintf(stderr, "No devices detected.\n");
goto out;
}
dev = fp_dev_open(ddev);
fp_dscv_devs_free(discovered_devs);
if (!dev) {
fprintf(stderr, "Could not open device.\n");
goto out;
}
printf("Opened device. Loading previously enrolled right index finger "
"data...\n");
r = fp_print_data_load(dev, RIGHT_INDEX, &data);
if (r != 0) {
fprintf(stderr, "Failed to load fingerprint, error %d\n", r);
fprintf(stderr, "Did you remember to enroll your right index finger "
"first?\n");
goto out_close;
}
printf("Print loaded. Time to verify!\n");
do {
char buffer[20];
verify(dev, data);
printf("Verify again? [Y/n]? ");
fgets(buffer, sizeof(buffer), stdin);
if (buffer[0] != '\n' && buffer[0] != 'y' && buffer[0] != 'Y')
break;
} while (1);
fp_print_data_free(data);
out_close:
fp_dev_close(dev);
out:
fp_exit();
return r;
}
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